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Vigneri, Valentino; Odenbreit, Christoph; Lam, DennisDifferent load bearing mechanisms in headed stud shear connectors for composite beams with profiled steel sheetingSteel Construction3/2019184-190Articles

Kurzfassung

Nominated for the Bernt Johansson Outstanding Paper Awards at Nordic Steel 2019
The current design rules of EN 1994-1-1 covering headed stud shear connectors for composite beams with profiled sheeting lead, in some cases, to an overestimation of the load bearing capacity. Owing to their empirical nature, these equations are not able to capture the real behaviour of the connector. Therefore, the load bearing mechanisms of the shear connection are identified in this work with the support of experimental and numerical results. According to the static system proposed, the concrete rib is modelled as a system of diagonal struts in combination with the stud in bending. It was observed that at 1-4 mm slip, a “strut and beam” mechanism prevails, where the resistance of the connector depends on the activation of the plastic hinges in the stud and on the capacity of the diagonal strut in front of it. By increasing the slip (approx. 4-10 mm), the surrounding concrete gradually crushes, while the tensile stresses at the edge of the rib reach the tensile strength of the material. Because of this loss of rotational stiffness, the bending moment in the stud decreases and the upper plastic hinge gradually moves towards the slab. At higher displacements (approx. 20-40 mm), high tensile forces develop in the stud due to non-linear geometric effects and the load is carried through a “strut and tie” resistance mechanism, provided that the embedment of the stud is sufficient to prevent the rotation of the rib. As the slip increases further, failure occurs either in the form of concrete pull-out or stud rupture.

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Richards, PaulA repairable connection for earthquake-resisting moment framesSteel Construction3/2019191-197Articles

Kurzfassung

Nominated for the Bernt Johansson Outstanding Paper Awards at Nordic Steel 2019
Most steel moment frames are designed so that the beams act as structural fuses during earthquake loading. This approach, while good for saving lives, has poor resilience because it is difficult to replace damaged beams in a building. A repairable steel moment-frame connection has been developed that may be attractive to engineers and building contractors. The connection has a fuse plate bolted to the beam bottom flange which experiences shear yielding during severe earthquakes, protecting both the column and the beam. After an earthquake, the fuse plates can be removed and replaced to unlock residual frame deformations and prepare the building for another event.
Full-scale experiments were conducted to validate the performance of this repairable connection. Two tests were performed with a W690 × 125 beam and W530 × 196 column. The tests demonstrated rotation capacities of at least 0.05 rad, which exceeds AISC requirements for special moment frames. The fuse plate was effective in preventing beam damage in each test, and the second test demonstrated that the connection could be repaired by replacing the fuse plate.

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Röscher, Stefanie; Knobloch, MarkusTowards a prognosis of fatigue life using a Two-Stage-Model - Application to butt weldsSteel Construction3/2019198-208Articles

Kurzfassung

Nominated for the Bernt Johansson Outstanding Paper Awards at Nordic Steel 2019
This paper presents a Two-Stage-Model for determining the fatigue life of steel structures. The model follows the distinction between crack initiation and crack propagation according to the phenomenological background. The first stage uses the local strain-life approach to predict the number of cycles for crack initiation Ni considering the cyclic material behaviour as well as the load-time history. The second stage calculates the crack propagation based on a linear-elastic fracture mechanics approach. Using X-FEM in combination with cyclic loading, an arbitrary, solution-dependent crack path is achieved to determine the number of cycles for propagation Np. The Two-Stage-Model was applied to butt welds to determine their total fatigue life Nf in terms of a proof-of-concept study. The study investigated the ability of the model to consider the influence of the weld geometry, i.e. plate thickness and weld imperfections (excess and vertical offset). The results are presented by means of S-N curves for initiation life, propagation life and total fatigue life. A comparison with experimental results provided in the literature shows that the Two-Stage-Model can reflect the weld quality of butt welds in terms of fatigue life.

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High hopes - why BIM does not pay off (yet)Steel Construction3/2019208Editor's Recommendations

Kurzfassung

Keine Kurzfassung verfügbar.

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Nielsen, Martin Bjerre; Jensen, Jacob Fisker; Harper, Christopher; Knudsen, Lennart Skovbjerg; Pedersen, Ronnie RefstrupState-of-the-art framework for design of offshore wind jacket foundationsSteel Construction3/2019209-214Articles

Kurzfassung

Nominated for the Bernt Johansson Outstanding Paper Awards at Nordic Steel 2019
A state-of-the-art framework for the design of jacket foundations for offshore wind turbines is presented here. The article illustrates how an efficient, yet highly accurate, structural model can be achieved through a combination of a comprehensive beam finite element model and detailed shell/solid finite element models, where the former suffices for representing the overall global behaviour and the latter improves the representation of non-trivial structural details such as the transition piece and tubular joints. This approach allows the verification of standard structural elements according to various design codes to be automated on beam element level, while the fatigue performance via the hot-spot method as well as detailed stress and buckling analyses of relevant joints and details can be performed based on the detailed shell/solid finite element models readily available for stiffness representation. The computational framework ensures full consistency between the local and global description levels and an efficient cloud interface facilitates the thousands of design load cases that typically require consideration in order that a full detailed design can be simulated within a reasonable timeframe.

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Vales, Pedro Casariego; Ribera, Miquel Casafont; Ballester, Miquel Ferrer; Carvajal, Frederic MarimónCompression behaviour of trapezoidal steel sheets with transverse corrugationsSteel Construction3/2019215-221Articles

Kurzfassung

Nominated for the Bernt Johansson Outstanding Paper Awards at Nordic Steel 2019
Over the past few decades, the cold-formed steel industry has developed a manufacturing technique for producing self-supporting arches from trapezoidal steel sheets. The press-forming procedure is based on introducing transverse corrugations into the main direction of the flat profile in order to bend it. The main problem is that these indentations, which are essential to curve the profile, change the effective properties of the original steel sheet. Currently, there is no design code or standardized test procedure that can be used to obtain the effective properties of the corrugated profile. This research project analyses the behaviour of the corrugated profile when it is subjected to pure compression and compares it with the behaviour of the flat profile.

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Corman, Adrien; Jaspart, Jean-Pierre; Demonceau, Jean-FrançoisResistance of the beam-to-column component "column web panel in shear"Steel Construction3/2019222-230Articles

Kurzfassung

Nominated for the Bernt Johansson Outstanding Paper Awards at Nordic Steel 2019
The “column web panel in shear” is known to be a key component in the design of steel and steel-concrete composite joints as it can provide a reserve of ductility at the joint when activated and appropriately designed. Therefore, its behaviour has been studied for years and was thought to have been fully understood. However, some recent research projects have demonstrated that, in many cases, the simple analytical model proposed in Eurocode 3, Part 1-8, significantly overestimates the actual resistance of this component. In this context, this paper will look at the first results of investigations into that problem conducted at Liège University. In particular, beam-to-column welded joints have been studied in order to: i) highlight the aforementioned problem through comparisons between existing experimental results and Eurocode 3 predictions, ii) develop a sophisticated finite element model using the Abaqus© software, iii) validate this FE model using existing experimental results and iv) develop an extensive parametric study in order to highlight the key parameters governing the resistance capacity of the component studied. Based on the investigations conducted, the final goal consists of providing a new analytical formulation that is able to predict more accurately the shear strength of the column web panel.

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Fire design of slim-floor beamsSteel Construction3/2019230Editor's Recommendations

Kurzfassung

Keine Kurzfassung verfügbar.

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Avgerinou, Stella; Lignos, Xenophon; Tsarpalis, Dimitris; Vayas, IoannisFull-scale tests on used steel storage racksSteel Construction3/2019231-242Articles

Kurzfassung

Industrial storage operators use not only new pallet racking systems, but also old ones for which certification documents possibly do not exist. In order to check the carrying capacity of such racks, in addition to component tests, full-scale experimental tests were carried out on complete structures to help the development of reliable numerical models. The racks were subjected to vertical and pushover loads in the laboratory using an improved version of the base plates to achieve fixed support conditions. Vertical loading was imposed by filling tanks with water, an operation that was activated and controlled through an innovative hydraulic network specifically designed for this purpose. During the vertical loading tests, a moderate earthquake took place near the experimental facility and this influenced the rack behaviour positively. The spine brace was too flexible in the out-of-plane direction and did not participate in the resistance to lateral forces. Distortional buckling of the columns was observed at high lateral loads. The experimental tests allowed the calculation of conservative values for the behaviour factor q.

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Dulevski, EnchoEffective widths for class 1 and 2 composite girders at negative momentsSteel Construction3/2019243-248Articles

Kurzfassung

When ascertaining the effective widths of class 1 and 2 composite girders, it is claimed that at ULS, Eurocode 4 procedures give highly conservative results. A new approach to the problem is proposed in which the strain limitation values are introduced after deriving a new formula (graphically presented) with the intention of replacing the existing one. It turns out that the new effective width is significantly larger. Such a result leads to some advantages in reinforcement distribution in the support areas of continuous girders. It might also lead to some savings in reinforcing and structural steel. This is demonstrated by an example. Another example shows a situation in which the rough application of Eurocode 4 may produce a design with a lack of reliability for some of the bridge superstructure elements. The results obtained may also be useful for situations where a structure with composite girders already in service has to be redesigned for increased loads.

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Steel Construction News 3/2019Steel Construction3/2019249-260Steel Construction News

Kurzfassung

ECCS News: ECCS R&D activities
ECCS TCs activities
Joint action with ECCREDI partners
European Steel Day 2019 Brussels, 26 June 2019 Transitioning to the future of EU industry
News from ECCS members
Talking with: Sir Philippe Samyn
Bauhaus, Modernism and the Contribution of Engineers: bauhausTWINS - an installation by zukunfsgeraeusche
News: Steel Construction achieves first CiteScore value
Congress Advancements for Metal Buildings 14/15 October in Marseille
Book review: Kurrer, K.-E.: The History of the Theory of Structures: Searching for Equilibrium.
PHD-Thesis: Design Guidelines for highly glazed office buildings in steel composite construction developed by using dynamic thermal simulations, optimisation methods and life cycle assessment

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Events: Steel Construction 3/2019Steel Construction3/2019261Events

Kurzfassung

Keine Kurzfassung verfügbar.

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Inhalt: UnternehmerBrief Bauwirtschaft 3/2019UnternehmerBrief Bauwirtschaft3/2019Inhalt

Kurzfassung

Keine Kurzfassung verfügbar.

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Ernst & Sohn (Hrsg.)UBB 03/2019 - GesamtausgabeUnternehmerBrief Bauwirtschaft3/20191-36Gesamtausgabe

Kurzfassung

Keine Kurzfassung verfügbar.

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Inhalt: Bauphysik 4/2019Bauphysik4/2019Inhalt

Kurzfassung

Keine Kurzfassung verfügbar.

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Vorschau 5/2019Bauphysik4/2019Vorschau

Kurzfassung

Viktoria P. Krastel, Winfried Heusler, Klaus-Peter Sedlbauer: Zukunftsfähige Fassaden von Krankenhäusern - ein nutzerzentrierter Ansatz

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Titelbild: Bauphysik 4/2019Bauphysik4/2019Titelbild

Kurzfassung

Das neue Gemeindezentrum in Le Vaud ist ein Ort, der verbindet. Hier begegnen sich die Dorfbewohner bei sportlichen Aktivitäten, Veranstaltungen oder Feiern, und auch schulisch wird die Halle genutzt. Bis ins Detail haben die Schweizer Architekten Localarchitecture das Gebäude durchkomponiert. Von außen bezieht sich das Gemeindezentrum mit seiner markanten Formgebung auf die umliegende Berglandschaft. Im Innenraum gibt Holz den Ton an. Es schafft ein helles und freundliches Ambiente und verleiht den Räumen natürlichen Charakter. Dabei ist der konsequente Einsatz des Werkstoffes Holz - mit tragenden und akustisch wirksamen Deckenelementen von Lignatur - nicht nur gestalterisch beeindruckend, er sorgt auch für maximale Aufenthaltsqualität und ein gesundes Raumklima. (Foto: David Matthiessen, )

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Worch, Anatol; Stelzmann, MarioFeuchtetechnisches Verhalten von Innendämmsystemen mit hohen Dämmstoffdicken - Auswertung eines dreijährigen Monitoring verschiedener Innendämmsysteme mit hohen WärmedurchlasswiderständenBauphysik4/2019193-198Fachthemen

Kurzfassung

Bislang werden erhöhte Dämmstoffdicken einer Innendämmung mit einem erhöhten Tauwasserausfall in der Grenzschicht zwischen Dämmung und Außenwandkonstruktion in Verbindung gebracht. Der durch das Glaser-Verfahren geprägte Blick auf die Wasserdampfdiffusion ist jedoch ein sehr eingeschränkter Ausschnitt auf die tatsächlich ablaufenden Feuchtespeicher- und Feuchtetransportphänomene in einem innengedämmten Außenbauteil. Ein über drei Jahre laufendes Monitoring verschiedener Innendämmsysteme hoher Schichtdicken widerlegt jedoch dieses Vorurteil. Im Falle eines ausreichenden Schlagregenschutzes konnte keine Kondensation innerhalb der Konstruktion nachgewiesen werden. Durch das unterschiedliche Verhalten der Dämmung und des Diffusionswiderstands bezüglich der Dämmstoffdicke als auch die bislang wenig berücksichtigte Speicherung von Wasserdampf in den Baustoffen führt zu einer möglichen Reduzierung des ausfallenden Kondensats. Höhere Dämmstandards bis hin zum Passivhausniveau erscheinen auch bei Innendämmungen möglich.

Humidity-related behavior of internal thermal insulation systems with high insulation thickness - Evaluation of a three-year monitoring of various internal thermal insulation systems with high thermal resistances.
Increased thermal insulation thicknesses of an internal thermal insulation system have been associated with an increased amount of condensation within the boundary layer between the insulation material and the external wall construction. Influenced by the well-known Glaser method only vapor diffusion is considered. The real vapor transport and storage behavior of an internal insulated external wall is much more complex. A three-year monitoring of various internal thermal insulation systems with high layer thicknesses refutes the mentioned prejudice. The case of sufficient driving rain protection, no condensation could be detected within the construction. Due to different behavior of the insulation properties and the diffusion resistance with respect to the thickness of the insulation material as well as the considered storage capacity of water vapor in the building materials leads to a possible reduction of the precipitated condensation. Higher insulation standards seem to be possible.

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Technische Regelsetzung: Bauphysik 4/2019Bauphysik4/2019198Technische Regelsetzung

Kurzfassung

VDI 4640 Blatt 2 zur Installation von erdgekoppelten Wärmepumpen
Methoden und Beispiele für die Ermittlung von Messunsicherheiten

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Kain, Günther; Idam, Friedrich; Tonini, Sarah; Wimmer, AngelikaTorfmoos (Sphagnum) - historisches Erfahrungswissen und neue Einsatzmöglichkeiten für ein NaturproduktBauphysik4/2019199-204Fachthemen

Kurzfassung

Torfmoos (Sphagnum) ist ein von alters her vielfach eingesetztes Dicht-, Füll-, und Dämmmaterial. Im Zuge der Bemühungen trockengelegte Moore wieder zu vernässen, wird die technische Nutzung von Torfmoosen (Sphagnum farming) erneut diskutiert. Im Rahmen der vorliegenden Untersuchung wurden die Wärmeleitfähigkeit und das hygroskopische Verhalten von unterschiedlich schweren Torfmoosmatten untersucht. Es zeigte sich, dass Torfmoos ein sehr vielversprechendes Fugendichtungsmaterial ist und die Dämmeigenschaften jenen von Polystyrol oder Mineralwolle ebenbürtig sind. Darüber hinaus wurden prototypische Baudetails zur Verwendung von Torfmoos als Dichtungs- und Dämmmaterial für die Bauanschlussfuge von Fenstern entwickelt. Torfmoos könnte hier eine Alternative zum weitverbreiteten PU-Schaum im ökologischen Bausektor sein.

Peat moss (Sphagnum) - historic knowledge and new applications for a natural product.
Peat moss (Sphagnum) was a commonly used sealant, fill and insulation material in the past. In the course of the efforts to rewet drained moors due to ecological reasons, the technical use of peat moss (Sphagnum farming) is in the focus of attention again. In the framework of this investigation, the thermal conductivity and the hygroscopic behavior of moss mats with varying density was investigated. The results showed that peat moss is a promising insulation material for building joints, because its thermal conductivity is comparable with the one of polystyrene or mineral wool. Moreover, prototypic building details were developed focusing on the application of peat moos for the insulation of the mounting gap of windows. In this respect, peat moss could be an ecological alternative to the widely used polyurethane foam.

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FLiB-LuftdichtheitskonzeptBauphysik4/2019204Aktuell

Kurzfassung

Keine Kurzfassung verfügbar.

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Flemming, Daniela; Eitle, Adrian; Park, SumeeThermische Behaglichkeit bei Temperaturübergängen - Literaturstudie und -analyse von ProbandenexperimentenBauphysik4/2019205-216Fachthemen

Kurzfassung

In den letzten Jahrzehnten haben sich die Möglichkeiten zur gezielten Steuerung klimatischer Parameter in Innenräumen durch leistungsstarke Anlagentechnik deutlich erweitert. Auch wenn die meisten Räume natürlich gelüftet werden, sind der Regelung der Innenraumbedingungen technisch gesehen kaum noch Grenzen gesetzt. Gleichzeitig hat sich beispielsweise die Arbeitswelt stark geändert, Büros und andere Räume werden oft nur temporär genutzt und dabei auch noch geteilt. Die thermische Konditionierung der Innenräume hingegen orientiert sich aber immer noch an stationären Temperatursolllinien für die gesamte Betriebszeit. Für Konzepte zur dynamischen Steuerung und Regelung des Raumklimas fehlen gezielte wissenschaftliche Anhaltspunkte zur Bewertung der thermischen Behaglichkeit. Im Rahmen dieser Arbeit erfolgte eine Literaturstudie zu durchgeführten Probandenstudien bei Temperaturübergängen. Die Probandenstudien wurden deskriptiv beschrieben und miteinander verglichen, um aus der Gesamtheit dieser Studien Erkenntnisse hinsichtlich der thermischen Behaglichkeit unter diesen dynamischen Bedingungen zu gewinnen.

Thermal comfort at temperature step changes - Literature study and analysis of subject studies
. In recent decades, the possibilities for the targeted control of climatic parameters in interiors have changed significantly due to high-performance HVAC-systems. Even though most of the rooms are naturally ventilated, there are no technically limits for regulation of the indoor climate. At the same time, the world of work has dramatically changed, offices and other rooms are often used only temporarily and also shared. However, the desired indoor conditions are based still on steady-state temperature set-points for whole operation duration. For concepts for the dynamic control and regulation of the indoor climate, there is a lack of scientific evidence for the evaluation of thermal comfort under transient conditions. In the context of this work a literature study on subject studies in transient climatic conditions was carried out. A descriptive description and a comparison of these subject studies was made to gain new insights into the thermal comfort after temperature transitions from the totality of these studies.

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Gollwitzer, Esther; Peper, Søren; Grove-Smith, JessicaHochenergieeffiziente Hallenbäder - Passivhaus-Konzept für Hallenbäder: Messungen und Leitfaden für die PlanungBauphysik4/2019217-226Berichte

Kurzfassung

In den letzten Jahren wurden die ersten Passivhaus-Hallenbäder intensiv untersucht. Bereits bei diesen Pilotprojekten konnte der Heizwärme- und der Stromverbrauch in erheblichem Umfang gesenkt werden. Aufgrund dieser Erfahrungen können in zukünftigen Bädern noch weitere Potenziale genutzt werden. Dabei ist es entscheidend, die Möglichkeiten des Zusammenspiels von Architektur, Technik und Betrieb zu nutzen, um damit die Energiekosten im langjährigen Betrieb zu senken. Im aktuellen Forschungsprojekt wurden Untersuchungen (rechnerisch und messtechnisch) u. a. zu Verdunstungsraten, Energiebilanz des Beckenwassers, Schadstoffkonzentrationen und Lüftungsregelung durchgeführt. Die gewonnenen Erkenntnisse und Planungswerte erleichtern es, die wesentlichen Einflussfaktoren für die Planung, den Bau und den Betrieb von energieeffizienten Hallenbädern zu identifizieren und zu optimieren. Schon mit dem Entwurf (Zonierung, Lüftungszonen, Verglasungsanteil, Rohrlängen, Höhenunterschiede etc.) können die Weichen für ein kostengünstiges und gleichzeitig höchst energieeffizientes Bad gestellt werden. Als Hilfestellung für weitere Bäder (Neubau und Sanierung) bieten sich der erschienene Leitfaden mit Planungshinweisen und die Checklisten für Inbetriebnahme bzw. Betriebsoptimierung an [2].

Highly energy-efficient indoor swimming pools - Passive house concept for indoor swimming pools: Measurements and guidelines for planning
. In recent years, the first Passive House indoor swimming pools have been intensively investigated. Already in these pilot projects, it was possible to reduce heating and electricity consumption to a considerable extent. On the basis of this experience, further potential can be exploited in future projects. It is crucial to use the possibilities of the interplay of architecture, technology and operation in order to reduce energy costs in the long-term use of the building. In the current research project investigations (theoretical and based on measured data) were carried out on evaporation rates, energy balance of the pool water, pollutant concentrations and ventilation control. The gained knowledge and planning values make it easier to identify and optimise the essential influencing factors for the planning, construction and operation of energy-efficient indoor swimming pools. Already with the design (zoning, ventilation zones, proportion of glazing, pipe lengths, height differences etc.) the course can be set for a cost-effective and at the same time highly energy-efficient pool. The published guideline with planning information and the checklists for commissioning and optimisation of operation [2] offer assistance for further indoor swimming pools (new construction and renovation).

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Aktuell: Bauphysik 4/2019Bauphysik4/2019227-230Aktuell

Kurzfassung

Klimaschutz erfordert mehr PV-Anlagen mit effizienten Speichersystemen
Gütegemeinschaft Fertigkeller für praxistaugliche WU-Richtlinie
BAM erforscht Lehmmauerwerk für den nachhaltigen Wohnungsbau
Stellungnahme des VBI zum Entwurf des neuen Gebäudeenergiegesetzes GEG
Verfahrbares Membrandach und 13 verschiedene Fassadentypen für Tennisareal Wimbledon
Symposium Ingenieurbaukunst - Design for Construction am 22. November in Stuttgart
Fachgerechte Fenstermontage mit dem ift-Montageplaner

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Veranstaltungen: Bauphysik 4/2019Bauphysik4/2019230-232Veranstaltungen

Kurzfassung

Keine Kurzfassung verfügbar.

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